Question

Write the expression for value of angle corresponding to zero intensity locations.

Answer 1

The black fringes (minima) in a single-slit diffraction arise at angles where destructive interference happens. These angles are given by:

a sin θ = mλ

Where,

a = Slit width,

θ = Wavelength of light

θ = Diffraction angle

m = 1, 2, 3    ...(integer, not including 0, since m = 0 corresponds to the central maximum)